Apparatus for removing incombustibles from stokers



Oct. 20, 1931. H. c. CARTER 1,828,700

APPARATUS FOR REMOVING INCOMBUSTIBLES FROM STOKERS Filed Jan. 4, 1950 2Sheets-shea 1 Oct. 20-, 1931. c, CARTER 1,828,700

APPARATUS FOR REMOVING INCOMBUSTIBLES FROM STOKERS Filed Jan. 4, 1950 2Sheets-Shee 2 T'T'UEA/E Patented Oct., 20, 1 931 UNITED STATES PATENTOFFICE" HASKELL C. CARTER, OF PORTLAND, OREGON, ASSIGNOR TOIRON FIREMANMANOFAC- TUBING COMPANY, OF PORTLAND, OREGON APPARATUS roia REMOVINGINGOMBUSTTBLES FROM STOKERS Application filed Ianuary.4, 1930'. SerialNo. 418,474.

This invention relates generally to underfeed stokers, and particularlyto means for removing 'unburned'materials from the retort.

1 The main object of this invention is to provide a clinker removerwhich will scrape the clinkers from the fire bed before they have becomefused, and to then'crush and remove these clinkers from the fire bed.

jg The second object is to carry the crushed out requlring lubrication,and at the same I time will be so arranged as to permit its introductioninto the relatively small door opening of a furnace. 2,5 These, andother objects, will become more apparent .illustrated in theaccompanying drawings, in which: Figure 1 is a vertical section throughthe '0 device.

Figure 2 is a fragmentary elevation of the drive gears with the casingbroken away to disclose same.

Figure 3 is a section taken along the line 3-3 in Figure 1.

Figure 4 is a vertical section taken along the line 44 in Fig. 21Similar numbers of reference refer to similar parts throughout theseveral views.

Referring in detail to.the drawings, there is illustrated the fuel feedduct of 'an underfeed stoker on whose retort end is mounted the circulartuyere 11 provided with the usual air outlet openings 12 and 13.Surrounding the discharge end of the duct- 10. and also supporting thetuyere 11, is an air box wall 14. Within the duct 10 ismounted a fuelfeed screw-'15 whose shaft 16 projects through the end of the duct 10and its square end 17 recesses in the shaft 18 Y and is driven thereby.

from the specification following as of a drive pinion 19. The shaft 18journals in the bearing 20 of the gear case 21, which.

also carries a stud 22 upon which is mounted the gear 23 which mesheswith the pinion 19 A cover plate 24 is placed over the pinion 19 and thegear 23.

Disposed around the outer sides of the .tuyere 11 are the groovedrollers 25 which are supported by means of the brackets 26 which, inthis instance, are bolted to the sides of the tuyere 11. Supported inthe grooves of rollers 25 is a ring gear 27 which meshes with the gear23 and is driven thereby.

Mounted on the tuyere 11 is an outwardly flaring inner crusher element28 which is stationary and is illustrated as being bolted to the tuyere11. The outer side 29.0f the crusher element 28 is provided with thegrinding ribs 30, which' are inclined for reasons which will beexplainedlater. The upper rim 31 of the crusher element 28 is provided withnotches 32 which materially assist in the process of breaking up theover-hanging pieces of clink ers and starting them on their path throughthe crusher.

Surrounding the tuyere 11, just below the stationary crusher 28, is ahorizontal stationary ring 33 which has formed therein an opening 34through which ground clinkers can find their way into the delivery chute35 into an ash collector box 36, orinto any other suitable dischargemechanism that may be provided. The final disposition of the clinker andashes is of secondary importance to the v actual removal of same fromthe retort and the maintaining of same in a condition in which theywould be easily removable. It is preferable to provide the ring 33 withan upturned flange 37 at its outer edge.

Secured to the ring gear 27 by means of the bolts 38 is a rotary crusherelement 39 v whose inner-side 40 is provided with a plurality ofgrinding ribs 41 whose lower ends converge toward the ribs 30. The ribs41 slope in a direction opposite to that of the 5 ribs 30 and in therotary element 39 the advancing end of the ribs 41 is uppermost, causinga forced feed to assist gravity in passing. clinkers between thegrinding ribs 41 and 30. On the rotary crusher element 39 0 the furnacebase 46. Attached to the inner have passed off and the incombustiblesare wall 44 just above the rotary crusher element 39 is a guard ring 47which serves to prevent the clinkers from passing down the outside ofthe crusher element 39.

In the operation of the device coal 48 is fed upwardly through theretort-by means of the screw 15 passing through the various stages ofcombustion on its journey until it reaches the rim 31, by which time thecombustibles either in the form of a clinker or ash, depending upon thekind of coal burned, the

rate of combustion and the intensity of the heat developed. If theincombustibles pass over the rim 31 in the form of finely dividedparticles there is of course no difliculty encountered in the removal ofsame, but 1f, as is commonly the case with this type of a stoker, aclinker 43 is formed it is broken away from the main body of the fuel bymeans of the breaker bar 42, the over-hangmg portions falling betweenthe grinding IlbS 30 and 41 where they "are still further 'reduced insize until the maximum in size will readily pass through the opening 34.

Itwill be seen from the above that the clinlger is not permitted tocongeal and solidify to a point where the crushing operation wouldbecome at all difficult, but it is removed and broke up while still in arelatively fragile form. v

It will also be understood tha ash, removers have been constructed inthe past in which it was assumed that all of the incombustibles wouldpass ofl' without forming a clinker.

.Should this assumption be correct these devices would worksatisfactorily, but it is to overcome the condition of clinkering whichis common in this class of devices that the above described apparatushas been constructed.

It will be noted that the ribs 30 on the stationary member, althoughindicated as being sloping'in a direction opposite to the ribs 41 on.the revolving member, may in some instimces be upright, or at someintermediate ang e.

It is important that the adjacent faces of the stationary and rotarymembers 28 and 39 converge downwardly approximately in the mannerillustrated for the purpose of securing the desired crushing action.

I claim:

1. In a stokerthe combination of a retort throughwhich coal can be fedupwardly, a

ary grinding element, said grinding elements having grinding ribs ontheir adjacent faces between which the. overflow from said retort mustpass, and means for rotating said rotatable grinding element.

and having grinding ribs on the outer side thereof, a rotatable grindingelement surrounding said retort outlet and spaced therefrom, a clinkerbreaking bar secured to said rotatable element and projecting; upwardlybetween same and said retort outlet, and means for rotating saidrotatable element in a manner to-cause said breaking bar to separateprojecting clinkers from the fuel bedto cause same to be crushed betweenthe inner side of said rotatable element and the outer side of saidretort outlet.

.3. In'a stoker the combination of a stationary circular retort havinggrinding ribs formed on the outer side thereof, a rotatable grindingelement surrounding the upper por-' tion of said retort having grindingribs on the inner side thereof converging with the grinding ribs of saidretort, said grinding ribs sloping in, a downwardly feeding direction, afloor plate under the space between said grinding elements having anopening therein through which ground clinkers can 4. An ash remover forunderfeed stokers having in combination a retort having an outwardlyflarmg circular rim having grinding ribs formed on the outer side of itsuppermost portion, an outer grinding element spaced'from said retort rimand converging 'kdo'wn-wardly therewith at the adjacent faces thereof,said outer element having grinding.

ribs therein sloping in relation to the grinding ribs on said retort rimin a manner to cause a resulting downward movement of materials, amovable breaking bar operating between and above said grinding elements,a guard around the top of said outer grinding element adapted to preventmaterials from passing down on the outside thereof, means for rotatablymounting said outer grinding element and for driving same in a directionin which the advancing edges of its ribs will be uppermost, and meansfor collecting and disposing of the ground clinkers passing between saidgrinding elements.

HASKELL C. CARTER.

' stationary circular grinding element forming an outlet for saidretort, a rotatable grinding element mounted outside of said station-

